Wear what your favorite MLB players wear on the field! This Authentic Collection Therma Base 3-in-1 Triple Climate Jacket with Therma Base enhanced technology keeps you warm and comfortable yet is lightweight with reduced bulk. It's full range of motion functionality allows you to throw, swing or field while wearing it. The outer shell helps to protect from additional elements and to keep you dry.100% Polyester Crossfire Weave, fleece lined through the body and sleeves, quilted sport weight polyfil for warmth